what am i doing wrong?
A few things come to mind.
1) You’re level 62 in a level 65 area. Higher level mobs do more damage to you and take less damage from you. Find a level-appropriate area (either same level as you or lower – the level downscaling will take care of the difference).
2) Check you gear if you gear is more than a couple levels lower than you, it might be time to get something better.
3) Elementalists are squishy. Learn to time your dodges better, learn to use the active defenses your staff has in other attunings than fire, maybe switch out some of your utilities – which are a bit heavy on the conjures – to something more defensive. Or maybe try a different weapon set. I’m by no means an expert, but I find that while staff has nice damage and utility, I fare better with a dagger/focus or dagger/dagger build when the mobs put some pressure on me.